Effect of ‘natural deoderants’

Hi, I recently stopped using antiperspirant. I found that as long as I wasked my armpits several times a day, there was no odor. However, the realities of a hot summer and busy workplace meant I had to find an alternative. I started using a natural magnesium deodorant. I now find the odor worse on days when I don't use it. I understand that magnesium is incredibly alkaline. Does this affect the microbiome?